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Subsequent Events - Additional Information (Detail) - Subsequent Event
₨ / shares in Units, ₨ in Millions
1 Months Ended
Jul. 21, 2016
INR (₨)
₨ / shares
Dividend paid  
Subsequent Event [Line Items]  
Dividend paid, per share amount | ₨ / shares ₨ 9.50
Dividend paid, total amount | ₨ ₨ 24,083.1
Dividend Declared  
Subsequent Event [Line Items]  
Dividend declared, date approved Jul. 21, 2016
Dividend declared, board of directors meeting date Apr. 22, 2016